Testosterone Pellet Use in Transgender Men.

Purpose: We assessed the efficacy and short-term adverse effects of testosterone pellet use in transgender men to broaden therapeutic options.

Methods: We conducted a retrospective study of 30 transgender men who started testosterone pellets between 2018 and 2020.

Results: Testosterone pellets were started at dosages 675-825 mg per cycle and dose was adjusted according to testosterone levels obtained 1 to 6 months post-testosterone pellet insertion. Pharmacokinetics of testosterone pellet in transgender men was similar to those in cisgender men. Total testosterone levels reached a peak in 1 month and remained in the therapeutic range for ∼4 months in the range of 300-800 ng/dL. After switching over to testosterone pellets, 100% of patients continued to achieve amenorrhea and deepening of their voice. Most of the patients noticed increased hair growth in androgen-dependent regions (96.3%) and improved libido (70%). Adverse events were notable for a rate of polycythemia that was unexpectedly high at 46.67%. Pellet extrusion was found in 13.33% of patients. There was a low rate of pellet site hematoma (6.67%) and cellulitis (3.33%). No thromboembolic or cardiovascular events occurred in any of the patients.

Conclusion: This study reveals that testosterone pellets are a reasonable alternative to other testosterone modalities in transgender men but would use caution in patients with a history of polycythemia or higher risk for thromboembolic events.